The television technology in which a new form of light-emitting crystals which can be printed onto flexible plastic sheets to produce a paper-thin display that can be rolled up and carried in a pocket is:

Quartz crystals have piezoelectric properties: they develop an electric potential upon the application of mechanical stress. An early use of this property of quartz crystals was in phonograph pickups. A common piezoelectric use of quartz today is as a crystal oscillator. The quartz clock is a familiar device using the mineral. Quartz is also strongly pyroelectric. Temperature changes create positive and negative charges within the crystal.

6.

Which of the following statements is not true regarding LASER?

[A] A LASER is a device that emits light through a process of optical amplification .[B] LASER beams can be focused to very tiny spots, achieving a very high irradiance.[C] The emitted LASER light is notable for its high degree of dispersive power unattainable using other technologies.[D] LASER light is used in bar-code scanners

Kinetic Energy is a product of half the Mass times Velocity Squared. When the velocity is doubled, the Kinetic energy would go up four times. If velocity is tripled, kinetic energy would go up nine times. If velocity is increased by 1.5 times the Kinetic energy would go up by 1.5×1.5=2.25 times.

8.

Two Flat mirrors are placed at an angle of 60° from each other. How many images will be formed of a Candle placed in between them?